Therapeutic lamp unit



R. H. MAXSON THERAPEUTIC LAMP UNIT Filed Oct. 11. 192

Sept. 30, 1930.

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Patented Sept. 30, 1930 UNITED STATES.-

PATENT OFFICE;

BOLLAND H. IAXBON, OI MON, WISCONSIN, LS8IGNOB TO THE BURDICK CORPORA- DION, O1 HILTON, WISCONSIN, A CORPORATION 01 DELAWARE rnnnnm'rrc mun um'r Applicatloafled mm 11, m8. Serial in. 140,841.

My invention relates to therapeutic lamps. It relates more particularly to an improved light and heat generatin unit for use in'therapeutic lamps wherein ti red and infra-red rays are of primary concern, although, of course, it may be applied to other lamps. 7 An object of my inventionis to provide-an improved radiant energy generating unit for use in therapeutic lamps, the unit being con': structed in an improved manner to prevent undue heating of the plug upon which said unit is mounted.

Another object is to provide a generating unit having a more effective shape.v

Another ob ect 1s to provide a generating unit having an unobstructed surface for the emission of red and infra-red rays. G Another object is to provide a generating unit which is securely mounted onits base plug and which has an unobstructed outer surface.

Another object is to provide a (generating unit having a fixed resistance an an unobstructed radiating surface heated thereby.

Another object is to provide a generating unit and method for forming the same which may be carried out in a very simple manner to produce a generating unit of simpleconstruction and which is very eiiicient in use.

Other objects and advantages will appear as the description proceeds. In the accompanying drawings, 4. Fig. 1 is a side elevation of the radiantem ergy generating unit of my invention mounted in a suitable reflector which is shown partly in section; Fig. 2 is a sectional elevation of the radi- 0 ant generating unit: and

Fig. 3 is a view of the conical support or core used in the unit.

The therapeutic lamp comprlses generally a substantially parabolic reflector 6 carried on a plug receptacle housing 7 an electric screw plug receptacle 8 mounted in housing 7, a handle 9 attached to the housing, and a radiant energy generating unit 10 carried by the screw plug receptacle. The handle, housbe of any suitable construction which will e production of the ing, screw plug receptacle, and reflector may.

convniently serve the P pose of connecting the generating unit to a source of electric current and will effectively reflect the rays emit ted thereby.

My new and improved my or radiant energy generating unit has a conical core 11, preferably hollow, and composed of lava or other appropriate non-conducting and heat resisting material. This core is provided with a elical groove 12 in which is wound an electrical resistance element 13 of any suitable material, such as wire. A covering 14 of silicon carbide or other suitable material surrounds the electrical resistance element andis heated thereby.

Core 11 is mounted on an insulatin lug 14 adapted to fit in the conventiona? irm ofelectric socket or plug receptacle. Screws 15 firmly secure the larger end of the core to said plug and post 16 rigidly supports'the upper end of said core. This post 16 is of metal and acts as a conductor connecting-the upper end of the resistance element to the central or inner contact 22 of the plug. The upper end of post 16 carries metallic washers 17- between which the end of the resistance element is firmly clamped by a nut 18. A a metallic cap 21 also screws on the upper end of post 16 and protects the upper end of the core and coverin medium and 'also neatly and attractively fihishes the upper end of the unit. The lower end of resistance element by screw 20 to the threaded metal errule 21' which forms the outer screw contact of the plug and which serves to maintain the unit in its cooperating receptacle.

In using my invention, the generatin ele- 13 is prolonged .as at 1'9 and securel attached embodiment of my invention, what I claim and desire to-secure by ters Patent is as follows:

1. A therapeutic lamp unit comprising a base, a hollow heat resisting core mounted thereon, an electrical heatin coil wound about the outer surface of sald core and a relatively heavy coating of heat radiating material deposited on the sides of said core and entirely covering said electrical heating coil whereby heat from the coil may be uniformlv radiated from all sides of the unit.

2. A therapeutic lamp unit comprising a United States Let- -p1ug base, a hollow substantially conical heat resisting core mounted thereon at its base and projecting with its apex outward, an electrica heating coil wound about the outer surface of said core, a covering of heat radiating material of substantially conical form over said core and coil to completely imbed the latter, said covering being insulated from the plug base, and a connection between the plug base and apex of the core and having electrical connection with one end of the coi 3. A therapeutic lamp unit comprising a plug base, a hollow substantially conical heat resisting core mounted thereon at its base and projecting with its apex outward, an electrical heating coil wound about the outer surface of said core, a covering of heat radi ating material of substantially conical form over said core and coil to completely imbed the latter, said covering being insulated from the plug base. and a connection between the plug base and apex of the core and having electrical connection with one end of the coil, said connection having a cap enveloping the apex end of the covering.

4.- In a therapeutic lamp unit, a plug, a hollow conical core of non-conducting and heat resisting material attached to the plug and having a helical groove in its periphery, a resistance element mounted in the groove of the core, and a hollow conical radiating covering over the core and resistance element, said core forming a heat insulating chamber between the plug and the resistance element.

5. In a therapeutic lam a plug receptaole, a parabolic reflector t ereon, a plug for engagement with the receptacle, a core mounted on the plug and having an interior heat insulating chamber, a conical resistance element carried by the core and a cone shaped radiating surface surrounding said elements and entirely covering the same, said radiatin surface having its apex outward and servlng to radiate energy axially of said element in conjunction with the reflector.

6. In a thera )eutic lamp unit, a plug having a flange, a ollow conical core having a flanged base and removabl attached to the flange of the plug and having a helical groove in its periphery, an electrical resistance wire mounted in said groove, a conical radiating surface surrounding said resistance, a ferrule on the plug for connection with one end of the resistance wire, and a post connecting the plug and apex end of the core and having connection with the other end of the resistance wire, the radiating surface bearing against the flange of the core and being insu ated thereby from the plug.

In witness whereof, I hereunto subscribe my name this 7th da of October, 1926.

ROL AND H. MAXSON. 

